UK Window London offers an unsurpassed range of uPVC window systems suitable for every type of new or replacement project. As one of the largest profile-extrusion company's in the UK, whether you need 70mm profiles for seamless replacement of wooden frames, contemporary styles or enhanced energy efficiency which can help to reduce energy bills. We have attractive, easy-to-fit, traditional vertical sliders, low-maintenance window systems to suit you. With a long-life performance, all window systems come with a 10 year guarantee.